レイノルズ平均乱流モデルに基づく壁面境界条件のLESへの適用(<小特集>:LES(ラージエディシミュレーション))

概要

論文の詳細を見る
If we take a no-slip boundary condition at the wall in LES, many grids are needed near the wall. But some wall models have been applied to decrease the calculation time for LES. In LES using the wall models, the wall shear stresses are calculated from them. This paper evaluates two types of the wall models, WM1 based on the standard logarithmic law and WM2 which solves the boundary layer equation (BLE) near the wall. WM1 holds well in the channel flow or the zero pressure gradient boundary layer (ZPGBL), however it is impossible to apply WM1 to the adverse pressure gradient boundary layer (APGBL);WM2 can involve the pressure effect because there exists the pressure derivative in BLE. In channel flow, both of WM1 and WM2 give a better prediction for the streamwise mean velocity than the LES with the no-slip boundary condition, though they need half grids as that of the LES with the no-slip boundary condition. In APGBL, WM2 predicts more successfully the wall shear stresses than WM1.
一般社団法人日本機械学会の論文
2000-11-25